Fix logbook list bullets with 2+ spaces

* lisp/org-agenda.el (org-agenda-get-progress): Accept multiple spaces
between the list bullet and "State" in the state-change regexp.

Previously, logbook list entries with more than one space between the
bullet and the beginning of the entry would be ignored.  I.e., if
a bullet is defined in org-list-two-spaces-after-bullet-regexp, two
spaces will be inserted after the bullet, and that prevents
state-changed entries from appearing in the Agenda Log Mode view.

lisp/org-agenda.el

@@ -5733,7 +5733,7 @@ then those holidays will be skipped."
 		 (when (memq 'closed items) (concat "\\<" org-closed-string))
 		 (when (memq 'clock items) (concat "\\<" org-clock-string))
 		 (when (memq 'state items)
-		   (format "- State \"%s\".*?" org-todo-regexp)))))
+		   (format "- +State \"%s\".*?" org-todo-regexp)))))
 	 (parts-re (if parts (mapconcat 'identity parts "\\|")
 		     (error "`org-agenda-log-mode-items' is empty")))
 	 (regexp (concat